The linear matter power spectrum \(\mathrm {P(k,z)}\)  is [1]}, [2]}
\(\mathrm {P(k,z)}=2\pi ^{2}\mathrm {H_{0}}^{-(3+n_{s})}\delta _{H}^{2}k^{n_{s}}T^{2}(\mathrm {k})\delta _{M}^{2}(\mathrm {z}),\) 
